title: High volume microinfusion suppresses local astrocyte response within nucleus basalis of rat.
abstract: Our study investigates the impact of different volume sham control and excitotoxin microinfusions in vivo on local reactive astroglial response within rat nucleus basalis (NB). We followed the effects of unilateral 200, 100, and 50 nL of sham-control (phosphate buffer PBS) versus ibotenic acid (IBO) microinfusions, mechanical NB lesion (10 µL Hamylton syringe needle positioned into NB for 5 min), or physiological control (intact brain), on the local reactive astroglial response within the NB site, by immunoreactivity against glial fibrillary acidic protein (GFAP). NB lesions were identified by NADPHdiaphorase histochemistry. Local astrocytes responses within NB were suppressed by both high volume microinfusions, PBS and IBO (200 and 100 nL) versus mechanical lesion. Our study has proved, for the first time, the volume of microinfusion as critical for any selective pharmacological stimulation or lesion in vivo, and suggest the microinfusion volume less than 50nL as protective for physiological astroglial reactivity.
authors.affiliation: University of Belgrade, Department of Neurobiology, Institute for Biological Research, Belgrade, Serbia.
authors.forename: I
authors.initials: I
authors.lastname: Bjelobaba
authors.forename: J
authors.initials: J
authors.lastname: Saponjic
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000187:drug effects / Q000502:physiology*; D020532:Basal Nucleus of Meynert / Q000166:cytology* / Q000293:injuries; D004305:Dose-Response Relationship, Drug; D018690:Excitatory Amino Acid Agonists / Q000633:toxicity; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D007051:Ibotenic Acid / Q000633:toxicity; D008297:Male; D009252:NADPH Dehydrogenase / Q000378:metabolism; D010477:Perfusion / Q000009:adverse effects*; D010812:Physical Stimulation / Q000009:adverse effects; D051381:Rats; D017208:Rats, Wistar
chemical_list: D018690:Excitatory Amino Acid Agonists; D005904:Glial Fibrillary Acidic Protein; D007051:Ibotenic Acid; D009252:NADPH Dehydrogenase